Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758070AbYBGQSQ (ORCPT ); Thu, 7 Feb 2008 11:18:16 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1755093AbYBGQR6 (ORCPT ); Thu, 7 Feb 2008 11:17:58 -0500 Received: from mail.vyatta.com ([216.93.170.194]:48620 "EHLO mail.vyatta.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755090AbYBGQR5 (ORCPT ); Thu, 7 Feb 2008 11:17:57 -0500 X-Spam-Flag: NO X-Spam-Score: -2.436 Date: Thu, 7 Feb 2008 08:17:51 -0800 From: Stephen Hemminger To: Marcin Koziej Cc: linux-kernel@vger.kernel.org Subject: Re: Bug? Kernels 2.6.2x drops TCP packets over wireless (independent of card used) Message-ID: <20080207081751.73916530@extreme> In-Reply-To: <56de948.2f1b076b.47aac980.bfd66@o2.pl> References: <56de948.2f1b076b.47aac980.bfd66@o2.pl> Organization: Linux Foundation X-Mailer: Claws Mail 3.2.0 (GTK+ 2.12.7; x86_64-pc-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1856 Lines: 38 On Thu, 07 Feb 2008 10:04:00 +0100 Marcin Koziej wrote: > > Hello, I have problem with wireless network connectivity; > I have tested this on two wireless cards, both giving same results: > These are: > 1) 02:00.0 Ethernet controller: Atheros Communications, Inc. AR5212 802.11abg NIC (rev 01) > working under madwifi-0.9.3.3 > 2) 00:0a.0 Ethernet controller: Linksys, A Division of Cisco Systems [AirConn] INPROCOMM IPN 2220 Wireless LAN Adapter (rev 01) > working under ndiswrapper on neti2220 driver > > On kernel 2.6.19 both cards are working fine (with same network configuration) > > Problems arise on kernels 2.6.2x, information below is from 2.6.23, but 2.6.24-rc8-git7 also was tested: > Both cards can associate with ap, and get TCP/IP configuration from the router. > Both cards can ping the router (0% packet loss), resolve hostnames using DNS (suggesting UDP is working fine). > However, when any kind of TCP connection is made, it hangs after initial handshake and maybe some ammount of data interchanged. This is checked by tcpdump provided below. > > This happens every time to all tcp connections. > You have the wrong mailing list: 1. You are using proprietary drivers (ndiswrapper and madwifi both have binary only parts). 2. The network developers read netdev@vger.kernel.org Sounds like you have a TCP corrupting firewall that mangles the window scaling. This is a known issue with buggy middleboxes that can not be fixed in Linux without limiting performance. Complain to the middlebox vendors or IETF. -- Stephen Hemminger -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/